function video_1(){
document.getElementById("video_1").style.display = "block";
document.getElementById("video_2").style.display = "none";
document.getElementById("video_3").style.display = "none";
document.getElementById("video_4").style.display = "none";
document.getElementById("video_5").style.display = "none";
}
function video_2(){
document.getElementById("video_1").style.display = "none";
document.getElementById("video_2").style.display = "block";
document.getElementById("video_3").style.display = "none";
document.getElementById("video_4").style.display = "none";
document.getElementById("video_5").style.display = "none";
}
function video_3(){
document.getElementById("video_1").style.display = "none";
document.getElementById("video_2").style.display = "none";
document.getElementById("video_3").style.display = "block";
document.getElementById("video_4").style.display = "none";
document.getElementById("video_5").style.display = "none";
}
function video_4(){
document.getElementById("video_1").style.display = "none";
document.getElementById("video_2").style.display = "none";
document.getElementById("video_3").style.display = "none";
document.getElementById("video_4").style.display = "block";
document.getElementById("video_5").style.display = "none";
}
function video_5(){
document.getElementById("video_1").style.display = "none";
document.getElementById("video_2").style.display = "none";
document.getElementById("video_3").style.display = "none";
document.getElementById("video_4").style.display = "none";
document.getElementById("video_5").style.display = "block";
}